Of same place



A. W. ROSE. Telephone Transmitter.

No. 229,843. Patented .luly13, 1880.

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WI Z'.,VJJSSL.S INV/3. v'lO/f By his Harney/.s-

UNITED 'STATES PATENT OFFICE.

ALLEN WnROSE, OFv NEW YORK, N. Y., ASSIGNOR TO CHARLES A. OHEEVER,

i OF SAME PLAGE. l

TELEPHONE-TRANSM ITT-ER.

To all whom it may concer/n Beit known that I, ALLEN W. RosE, acitizen of the Dominion of Canada, and a resident of the city, county, and rState of New York,

have invented certain new and useful Improvements in Electric Speaking- Telephones, of which the following is a specification.

My invention more especially relates to that class of instruments known as battery-tele- 1o phones, by which the strength of a continuous current is increasedor diminished by varying the pressure or area of conducting contact points or bodies through which the currentv passes.

. The apparatus most generally used for producing such variations consists, broadlystated, of a vibrating transmitting-diaphragm and a carbon button, through which thev current passes. Experience has demonstrated that it i `zo is better not to attachthe conducting-body permanently to the case of the telephone, but to mount it upon a yielding support, allowing a certain amount of play.l The well-known Blake transmitter, in which the conductingl z 5 body is mounted on an adjustable spring, is a good illustration of this last-mentioned form of apparatus. Experience has, however, demonstrated even this form of apparatus to be objectionable, it being difficult to permanently i 3o .adjust the tension of the spring properly', and

a very slight variation of such tension is often sufficient to prevent the proper working of the instrument.

The objects of my invention, generally speak- 3 5 ing, are to simplify the construction of the apparatus, to diminishits cost, and to increase its efficiency, which ends I attain by mounting two diaphragms substantially parallel to each other on a suitablecasing or support, and in- 40 terposing conducting-bodies, through which the circuit passes, between them. The diaphragms are electrically insulated from their support, and are preferably rendered adjustable with relation to each other.

The subject-matter claimed herein is specified in the claimsat the end of the specification.

The conducting-bodies employed by me preferably consist of carbon buttons or contact- 5o points brought directly in contact with each SPECIFICATION forming part of Letters Patent No. 229,843, dated July 13,1880.

n Application led October 27, 1879.

other; but platinum disks or surfaces may be interposed between them, as is well understood.

The accom panyin g drawing represents a vertical central section through one form of my improved telephone. i

rllhe details of construction shown, being-old and well known, except as hereinafter specilied, need not be particularly described here.

The casing, handle, or support is shown as 6o consisting lof two sections, C O', united by screw-connections S. Two diaphragms, A A', are inserted in a cavity in the casing, being separated by'an interposed elastic or yielding ring, R, of suitable well-known material.

The cap or mouth-piece C on the casing screws down upon the upper diaphragm, A, and serves to regulate the distance between the diaphragms by compressing the ring, as will readily be understood. 7o

The conducting bodies or contact-points shown consist of carbon buttons a af, fastened to the inner faces of their respective diaphragms and having their adjacent faces in contact. The current passes through these buttons in the usual way, one wire, w, of the circuit being connected with one diaphragm, and the other, w', with the other; or the conducting-wires may be connected directly with their respective 'carbon buttons, both of which 8o modes of construction are old and well known. The wires are .connected with binding-posts lc 7c', as usual.

The sections of the casing may be fastened together, when desired, by a locking-pin, P, passing through them, which pin maybe driven clear through the parts to the inner cavity of the telephone, it' desired.

' Experience has demonstrated that my improved instrument operates well both as a 9o transmittingand receiving telephone. The current passing through the carbon buttons causes the vibration of the receiving-diaphragms, which renders audible electrical undulations or impulses-transmitted through the line.

lliyimproved instrument is to be used in connection with a battery, induction-coil, and

other well-known appurtenances incident to this class of instruments, which appurtenances forni no part of the subj ect-matter of myinven- 10o tion, and consequently are not herein claimed. Neither do I claim herein the interpositioii of an independent conductor between the diaphragms, as that also constitutes the subjectmatter of another division of this lapplication.

I claim as of my own invention- 1. The combination, substantially as hereinbefore set forth, of two diaphragms, one having` the capacity of receiving: and transmitting sound-waves or aerial vibrations, and the other acting as acontact-spring to maintain the continuity ofthe circuit.

2. The combination, substantially as hereinbefore set forth, of two yielding diaphragms and interposed conductilig-buttons, each sccured upon its respective diaphragm, and with their adjacent faces in contact, whereby their pressure upon each other may readily be adjusted and maintained.

3. The combination, substantialy as hereinbefore set forth, of a casingr or support, a yielding diaphragm, a conducting-button mounted thereon in contact with the other conductingbutton, and an adjustingr device which regulates the pressure between the conductingbuttons by moving both the diaphragm and its conducting-button, thereby constituting both a transmitting diaphragm and a pressurespring.

4. The combination,substantially as hereinbefore set forth, of a casing or support, two diaph ragms, conducting-buttons or contact-points on said diaphragms in a telegraphic circuit, and mechanism for mutually adjusting the diaphragms and con tact-points relatively to each other to vary the pressure of the contactpoints.

5. The combination, substantially as hereinbefore set forth, of a casing composed of ad justable sections, two diaphragme mounted therein, and an interposed spring, whereby' the diaphragms may be adj usted relatively to each other.

6. The combination, substantially as hereinbefore set forth, of a casing composed ot' sections adjustably connected by a screw, au elastic ring, a diaphragm interposed between the ring and the adjustable section ofthe casing', and a contact-point with reference to which the diaphragm has the capacity of being adjusted.

ALLEN W. ROSE.

Witnesses:

S. F. SULLIVAN, W. A. PoLLooK. 

